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#1
01-14-2012, 08:49 AM
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Interesting concept in re: gas/ethanol
Yesterday I rebuilt my carb., on my 10hp.. Head gasket &points
Well sorta. I worked with a friend & watched him tear into it & I helped cleaning all the parts & visually took mental notes. Watching him tear it apart will make it easy for me when I break down my #122 12hp., this Spring. So I hope? He then noticed a gasket leak while the motor was on the bench. It just happened that I have a new gasket & he said let's do it. Boom took the head off & sure enough there were 2 areas that had a leak in the gasket. He told me that this engine Wes rebuilt cause of the new piston replacement some years (?) back He noticed it right off. Then he started explaining the black carbon build up because of the ethanol in gas. I showed him my newly purchased Gastron additive from Ace Hardware. He said it was good stuff. Then he explained what they used before they created additive. He told me that they used to add a few drops of oil to each gallon of gas to make it leaded gas again. This way NO carbon build up. This friend of mine worked for a lawnmower place rebuilding & fixing EVERYTHING associated with lawnmowers, tractors. He told me when they used to take in older tractors that he would rebuild them & the motors/trans (if needed) & re-sell them in their used dept.. I have known this guy through another friend but didn't know about his background until last week. It cost me 3 beers & dinner. WHAT A DEAL! Nik 
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#2
01-14-2012, 09:34 AM
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Quote:
 on that...A few drops of oil in a gallon of gas will have zero effect. Three drops of oil in a gallon of gas is a 0.005% concentration. More oil makes it past the rings into the combustion chamber and is burned than this amount, particularly if the engine is worn. Regardless of whatever is in the oil, there will be no effect at that concentration. Ever had the head off of an engine with bad rings? Tons of carbon buildup from burning oil. Furthermore, adding oil to gas does not make it leaded gas again since lead is not an engine oil additive; in fact, you don't want that in your oil- burning leaded gas in an engine will result in some of the lead winding up as sludge in the oil. Lead used to be needed because inferior valve and valve seat materials, but this is no longer an issue. I don't know if leaded gas actually prevents carbon buildup, but it doesn't matter because you'd just wind up with lead deposits to clean up instead of carbon. IIRC the interval in the service manual for removing the head and cleaning it is halved if leaded fuel is used...
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#6
01-15-2012, 10:08 AM
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I can't comment on adding ATF...I've not heard of anyone doing that before.
Quite a few people use MMO, and from what I've read of their experiences, it does seem to reduce carbon buildup. I have only used it extensively in one engine, a Briggs twin from a 580 that I thought was beyond help since it ran intermittently on one cylinder and was blowing oil overboard, probably because the rings on one cylinder were stuck from sitting. I put MMO in the oil and gas as per the instructions on the can, put in hotter plugs to keep them from fouling so quickly, and mowed 8" grass with a 50" deck for a few hours. At first, the engine was so down on power I'd have to put the clutch in every so often and let the engine and deck speed back up. After about 10 hours spread over a couple months, the other cylinder was hitting reliably, it started easier, the power came back, and the oil consumption dropped. I never had the heads off to see how much carbon there was, but it sure did help that engine.
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